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Two speakers are placed side by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5 meter and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? (the sound speed is 340 m/s)

a) 8.4 m

b) 9.1 m

c) 8.1 m

d) 7.7 m

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